通过测定热膨胀系数(CTE),分析了不同密度以及高温处理前后热解炭基三维编织炭/炭复合材料(3D C/C复合材料)的热膨胀行为,并与PAN基炭纤维以及热解炭的热膨胀性能作了比较.结果表明:PAN基炭纤维在1200℃以后,出现明显的负膨胀.从室温到100℃,C/C复合材料呈负膨胀状态,CTE与密度成正比;从100℃到1000℃,C/C复合材料的CTE-温度曲线基本遵循热解炭基体的热膨胀规律变化;超过1000℃以后,CTE-温度曲线出现峰值,表明热解炭的膨胀受纤维的限制.复合材料的热膨胀行为由纤维和基体二者决定.
Three dimensional braided carbon/carbon composites (3D C/C composites) were fabricated by chemical vapor infiltration.The thermal expansion behavior of these materials with various densities before and after heat treatment was investigated.It is found that PAN-based carbon fibers (CFs) have an obviously negative coefficient of thermal expansion (CTE) after heat treatment at 1 200 ℃.The CTE of the 3D C/C composites is negative from room temperature to 100 ℃ and is proportion to their density.In the temperature range of 100-1 000 ℃,CTE vs.T curves have an almost a constant slope and expansion behavior of the composite is similar to that of pyrocarbon.When the temperature is above 1 000 ℃,a peak is found in the CTE vs.T curves,indicating that expansion of the pyrocarbon is limited by CFs and the thermal expansion behavior of the composites is determined by both CFs and matrix.
参考文献
| [1] | 李贺军.炭/炭复合材料[J].新型炭材料,2001(02):79-80. |
| [2] | 韩红梅,张秀莲,李贺军,岳珠峰,李克智.炭/炭复合材料高温力学行为研究[J].新型炭材料,2003(01):20-24. |
| [3] | 韩红梅,Sergey V.Mikhalovsky,Gary J.Phillips,Andrew W.Lloyd.声电化学法在炭织物表面制备的磷酸钙涂层及其对成骨细胞活性的影响[J].新型炭材料,2007(02):121-125. |
| [4] | 孙乐民,李贺军,张守阳.沥青基炭/炭复合材料的弯曲断裂特征[J].新型炭材料,2001(03):28-31,41. |
| [5] | 薛辉,李贺军,侯向辉,李克智,韩红梅.压力梯度CVI工艺制备2D炭/炭复合材料的弯曲断裂行为[J].新型炭材料,2004(04):289-292. |
| [6] | J. NEUMEISTER;S. JANSSON;F. LECKIE .THE EFFECT OF FIBER ARCHITECTURE ON THE MECHANICAL PROPERTIES OF CARBON/CARBON FIBER COMPOSITES[J].Acta materialia,1996(2):573-585. |
| [7] | O.Siron;J.Lamon .Damage and failure mechanisms of a 3-directional carbon/carbon composite under uniaxial tensile and shear loads[J].Acta materialia,1998(18):6631-6643. |
| [8] | Zhao J X;Ding K H;Wei J X .Research on thermo physical properties and anti-thermal-vibration properties of C/C composites[J].Acta Materiae Compositae Sinica,1987,4(04):45-50. |
| [9] | Baxter RI.;Iwashita N.;Sawada Y.;Rawlings RD. .Effect of chemical vapor infiltration on erosion and thermal properties of porous carbon/carbon composite thermal insulation[J].Carbon: An International Journal Sponsored by the American Carbon Society,2000(3):441-449. |
| [10] | Li HJ.;Chen YX.;Hou XH. .Densification of unidirectional carbon-carbon composites by isothermal chemical vapor infiltration[J].Carbon: An International Journal Sponsored by the American Carbon Society,2000(3):423-427. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%